Operating System (OS)
Most of the microcomputer's operating systems like Apple DOS, MS DOS and PC DOS etc. are called disk operating systems because

None of these
they are partly in primary memory and partly on disk
they are memory resident
they are available on magnetic tapes
they are initially stored on disk

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Operating System (OS)
Process is

contents of main memory
None of these
a program in execution
a job in secondary memory
program in High level language kept on disk

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Operating System (OS)
A spooler is a

Queue of print job that are waiting to print
Program that coordinates the print job that are waiting to process
Location in memory that maintains the contents of documents until it prints
Message sent from the printer to the operating system when a print job is completed

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